JK Rowling, known for authoring 'Harry Potter' series, has reclaimed her billionaire title with an estimated net worth of $1.2 billion, according to Forbes. Rowling became the first billionaire author in 2004, dropping off Forbes' list in 2012 amid reports of giving $160 million to charity. Since 2020, she has been reportedly earning over $80 million/year from her books, etc.